通过一年的化学学习,我们熟悉了许多物质。请从以下物质中选取相

通过一年的化学学习,我们熟悉了许多物质。请从以下物质中选取相应的序号填空。石墨  盐酸   硬铝 氢气  食盐  福尔马林

1)海水中含量最高的盐是     2)可用制造飞机、轮船的是     

3)用于制造铅笔芯的是        4)最清洁的燃料是             

5)可用于金属表面除锈的是    ;(6)可用于制作动物标本的是_____ __

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